3-己基-4-氨基-1,2,4-三唑-5-硫酮在黄铜矿表面的吸附动力学与热力学  

Adsorption kinetics and thermodynamics of 3-hexyl-4-amino-1,2,4-triazole-5-thione on surface of chalcopyrite

作　　者：曲肖彦[1] 刘广义[1] 刘胜[1] 钟宏[1] 肖静晶[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2015年第7期2006-2014,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2013AA064101);国家基础研究发展计划资助项目(2014CB643403);国家自然科学基金资助项目(51474253)

摘　　要：合成了一种新型的三唑硫酮类表面活性剂—3-己基-4-氨基-1,2,4-三唑-5-硫酮（HATT）,通过红外光谱和核磁共振氢谱及磁谱对其结构进行了表征,研究其在黄铜矿表面的吸附动力学和热力学。结果表明：黄铜矿吸附HATT优选的p H值为4~8,吸附量随着温度的升高而增大;吸附过程符合准二级动力学方程,吸附活化能为13.06 k J/mol;HATT在黄铜矿表面的吸附等温线符合Langmuir模型,吸附焓变ΔH为71.52 k J/mol,熵变ΔS为348.7 J/（mol·K）,吸附自由能变ΔG为-28.95 k J/mol（298K）。HATT可能以单分子层化学吸附于黄铜矿表面,吸附为自发的吸热过程。FTIR光谱分析进一步证实HATT以化学方式吸附在黄铜矿的表面。浮选试验结果也表明,HATT是黄铜矿的优良捕收剂。A novel surfactant, 3-hexyl-4-amino-1,2,4-triazole-5-thione（HATT） was synthesized and characterized by infrared spectroscopy, 1HNMR and 13 CNMR. And its adsorption kinetics and thermodynamics on the chalcopyrite surface were evaluated. The results indicate that the preferable p H values for HATT adsorption on chalcopyrite surface are 4-8 and the adsorption amount increases with increasing temperature. The adsorption process conforms to the pseudo-second-order kinetics equation and the adsorption activation energy is 13.06 k J/mol. The adsorption isotherm agrees well with Langmuir model and the thermodynamics parameters ΔH, ΔS and ΔG are 71.52 k J/mol, 348.7 J/（mol·K） and-28.95 k J/mol（298K）, respectively. The adsorption of HATT on the chalcopyrite surface is a spontaneous endothermic monolayer chemisorption. The FTIR spectra further verify the chemisorption process. The flotation results also show that HATT is a superior collector for chalcopyrite.

关 键 词：3-己基-4-氨基-1 2 4-三唑-5-硫酮 黄铜矿 热力学 动力学 吸附 

分 类 号：TQ311[化学工程—高聚物工业] O64[理学—物理化学]